Improvement in pitmen



duden /tic acm eine;

CHARLES H. PERKINS, OF PROVIDENCE, 'RHODE ISLAND, ASSIGNOR TO PERKINS SHEET-IRON COMPANY, OF SAME PLAGE.

Letters Patent No. 109,047, datedNovember 8. 1870.

IMPROVEMENT IN PITMEN.

The Schedule referred to in these Letters Patent and making part of the same.

To all whomfit may concern.'`

Be it known that I, CHARLES H. PERKINS, of the city and county of Providence, in the State of Rhode Island, have invented a new and useful improved Pitman for Scythe of I\Iowiug-M-achine; and I do llerehaving a limited range of movement, in combination with the journal-bearing ofthe wrist-pin of the oper-v ating-crank for the knife of a harvester, as a means for permitting the angular movement`11ecessary for the pit-man connecting the crank with-the knife; and,

Second, in the "means for connecting the pitlnan-rod with the socket of the ball-joint referred to.

A in the several figures is a spherical ball, having a hole, B, through its axis, for a journal-l. earing,forthe crank-pin which actuatcs the knife.

G is the pitinan-rod.

The socketI) of the ball A is made in halves, a a', which, when placed face to face and bolted together, form a hollow sphere, which is occupied by the ball A. lVhile some angular movement is required of the pitman, which makes it advisable that this description of joint-connection should be used between the pitman and the wrist-pin of the Iactuating-crai'rk, it is desirable that the crank-pin should work in the bearing B of the ball instead of the ball revolving in its socket. Accordingly, its movement in the direction in which the crank revolves is entirely restrained, while a limited angular movement is permitted to the socket connected with the pitman-rod. This is effected by cutting a deep 'groove or channel, j`,in.the side of the ball, and inserting arivet-bolt, F, (considerably smaller in diameter than the width of the groove,) through earpieces, e, in the halves of the socket. The relation which the rivet-bolt holds to the groove in the ball is shown at iig. 4, from which it is apparent that, while the ball cannot turn with the crank-pin, a limited angular movement is permitted to the socket on the ball.

Each half of the shank G ofthe socket is cast with a dovctail recess, semicircular at the front end, and

'widening and iiattening, and becoming shallower as it approaches its end at b.l iThe pitlnan-rod, which is made of round iron, is ilattened and widened at its end, as seen at iigs. 3 and 4, to lit the dovctail cavity formed by the halves ofthe socket.

It is quite evident that, when the halves of the socket are bolted togethcrland the end of the pitman rod, so shaped, is inserted yas shown in the iigures, it

'will be firmly attached to the socket even without the aid ofa holding-pin, d.

The end of the halves of the shank of the socket should be clamped together by a-ferrule, e, driven onto a tapering scat.'

I do not claim a ball-'and-socket joint as a means of connecting the pitman for the knife of a mowing-nnb 'chine tothe operating-crank; but

Vhat I do claim as my invention, and desire to se-y cure by Letters Patent, is

l. Ihe combinatiouof the globular recessed socket D, rivctTbolt F, and thcball B, fitted to receive a' crank-pin, and provided with-the slot f, and-arranged with relation to the bolt F, substantially as described, for the purposes specied;

2. In combination with a pitman-rod having a fiattencd and widened end, the shank G, provided with corresponding dovetailed recesses, substantially as -shown and described;

C HARLES H. PERKINS.

Witnesses:

PETER F. HUGHES, BENJ. F. THUnsToN. 

